Commit a752d719 authored Sep 26, 2006 by Chuck Ebbert Committed by Andi Kleen Sep 26, 2006

[PATCH] fix is_at_popf() for compat tasks



When testing for the REX instruction prefix, first check
for 32-bit mode because in compat mode the REX prefix is an
increment instruction.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>

parent 8578bdf8

arch/x86_64/kernel/ptrace.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct child, struct pt_regs regs)
		case 0xf0: case 0xf2: case 0xf3:
		continue;

		/* REX prefixes */
		case 0x40 ... 0x4f:
		if (regs->cs != __USER_CS)
		/* 32-bit mode: register increment */
		return 0;
		/* 64-bit mode: REX prefix */
		continue;

		/* CHECKME: f0, f2, f3 */